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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e266bd057b5d60a51ab903939af553e2f476ee83c0449edcf7084a0fb52489' 
  AND token = 'Gt90YURLYSI9FabnYgl6eEAn1COSupmHOHJZ4aDAmCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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