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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d0f28fa61a5eb50599cbb2445c0afbbd6bc52e864d1051382ffd1ee19eac4b' 
  AND token = 'cIawqISiieVZPkaEKQH7uEyPHEcemPw1eimOYlgoplE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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