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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53bc09ab8972ed7138ea234b3f6196f1f205047418c9bbe9e039ecf8e3239354' 
  AND token = 'PgUBw9IwYyfMyixl1d359u0gfBaXPboRb+fEDl6k3as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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