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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2ae31c20f3be1a9e59673fecf3ab19c4682352e264ef0a295f1773fc46f06a' 
  AND token = 'L5edYY8jo3gz8waRxnpNIqDnDFag0MLcac/GKjDtFP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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