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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc67e76d9a5dca1ac5517721182adfaa5a9f06e102dc62f247074344fa900a4b' 
  AND token = 'BioptSBCzToF/6C9ZzyS5ZNETQ+PxguQlHDwP0oBFtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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