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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf39cf9f85c1d4a69fdaad6f6332da0c487e451e6b6e3ae91e89b1d95676e10' 
  AND token = 'LQghWhG7v0HyG8W5KmupvCGkrLehrg3CnRTwltkQt6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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