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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c94530308d9d17b8dbb7bf2d49087d83374ea138d1dcc3654f5cf55bb141e8' 
  AND token = 'k7HAI9RATgUxYIFJ3R9oUwEcV6X2b3HRJH7VxDtTF3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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