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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d856d62e3e54c87c4238b1eb0c0f39c8893879e46979710f0be5a05fc02446' 
  AND token = 'iuqmoFpN2+h+UHJPbE8ABRzcPDqwtSSsEzgbp5771IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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