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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a923723b59ba8763d484801128a9f5187a37dd550d516f51a71dbee3c288183' 
  AND token = 'AVqfUhzLHQnUq14C1Uo0B8wBFX5f2E5kIUq36Vx3oeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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