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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89409699ece46de8b0cbcfc3a5869ddc9886d8299295bfa0e961c243a7037ff7' 
  AND token = 'JNYLQmQy24yVHo6hxKebG39u0OZtNerU5W4COYUmNCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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