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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504182028402633fb4820a22f42d4c64b9463bbf5b37e5bcc7b10c53f0626ced' 
  AND token = 'Hd6jCT3noe/nyTpFllC7G2vAlzIycN0QX9kcW9ZcNh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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