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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ca47b20f3cd5a1c53dcfd63cfc43069bab638ad9eeb425cae8d969c24e399a' 
  AND token = 'bh37X4mXqNucdbW9ay/FFeYQjVeY3aTuB+pmxNdsmVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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