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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e7002e72c26fcb72e8ceb76dfbfe0d7de1d0346ad65cc6768faecb24f413ae' 
  AND token = 'PeG6pnMs3aZHOtyA2GD8eh/p5soutMiLNg5xGxCZtSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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