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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63789e655b1b9ac553a00860c14b719aa00b2b8f062c080058e02e6d6ba38836' 
  AND token = '7DD7Ht7KoTKrwqJYfV0LmE9cyu+0cpf46Ee+yWcCQsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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