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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e92e8c517f655ac7ad3f0e4b042b1033d05c62ed171f2e51ebe474c8baef67f' 
  AND token = '3fxmRXenoEqfFT6h1pDsEalr4ptaUPjnh5yLJ3GpCDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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