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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fa29648a46351cb05a9af59b0dab2a2a1a89c77de9710d9bf034616c55ce05' 
  AND token = 'nEeUWaKF3KC3XU0/ID2LF6nHzblKhvodP6R8eDpUZLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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