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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f701167b9598af5ad88d42ea7d0cb910e11a428b95aa9801b6e5eaeb5daf5943' 
  AND token = '4SgaEos2k7syuA95d/oP0iMP3fKRJAbSWL8AbI8r320=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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