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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd26c3dab7a6c8afce422f190183896db9ee8d7ede013e9082a0353fef260f3' 
  AND token = 'uG9kAo0Cub4SGNV8w1W7KimtG08wmEbDOLCxrwrkRps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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