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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2803fef32230b1ae85c5ee3d6017d614f2568b42dc4d7eb6bcc171165d72f770' 
  AND token = 'jjfUsSozb088RdrWqAAEIgmqT4q1K+i8xDs8r5PsP7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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