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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d62fac9929ba1bd4514e363b7728108b939f7a34aa1376267e82b1037069a90' 
  AND token = 'E9jrewrgNCJbOa1vEKQEpqRUILmlcmvto0NPI6beQLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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