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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649109329c97c918b8c8d97bd115ef4ddc73bb59005e285e97eb8dbae9b204d2' 
  AND token = 'rEKMJaAraAD+Od3xQwgYTW4Gqr4bYASVLID7vfZTfJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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