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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771737f093aeb9cf91894842acc43aca031189e406e9f4286d61d6d8f3064688' 
  AND token = 'grVRQfEAJiRAJyhjM018B4OHqZl0kfYn/8S2AfaVouU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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