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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5855628f28368ad076a2643d1b3739bae707da9e4ece713be68b9f5ac31983' 
  AND token = 'H1d1hXKMw3d7HHbo7ZnNWACDblMG7KuX16XRWGr74Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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