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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b26c23f5f613f9618cdc3d092ec6f4717570bac322df860dbd104fd6d420d74' 
  AND token = 'ct6LOmTZlfmFcLpd3xjarLR4X30sUwLA+trFpYrQA0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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