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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd258f3742d8d21d5492c3418454ae827255607dd8d68a3bd6a491f0a796519' 
  AND token = 'tJQE6bPei8S5JG1coacFJrnhE+8sl6d6G92GNu0S82A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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