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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eeda9cf36aaaf6fc32921733b99e319f0bf750d7eb4f65a42fd1175d44cf686' 
  AND token = 'hSfJrLgSv/KqLAEWcbrNYpbIAcc7I2E3ht+kDVjwyqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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