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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796e8cf7af05fa018ba164237feaf28c1ff4c60f19c67c80b0b3769f5ddf32f3' 
  AND token = '+kwvih3Tt//dS+8Azz/khHAQVBa/Q4N2Ehpk6cR9p8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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