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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43497547cce813c68b56b168aefbbf006731f4de9d39842559328109d4b66a02' 
  AND token = '5YDbkuL2e2f/4CD3VozIGO4HAS3BJs6uGhuThl8/krc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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