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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b826494171a29e4dacc075035d55fafbb554063ec322956bf8a68a9f6b3acd9b' 
  AND token = 'zI13brlH66ThAq+MJ8Q29SBI3iiFTiyGmhzNWsM4NzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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