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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb41d813affcca893758fc1ac393779e470f655aa05580e1ae8f68f9c1907d86' 
  AND token = 'kE3WyzIgiSZ/VMFekQc+KQDr67z5qr7t1bJVk11cP4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}