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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e907c58cb94790efcca6a460b66d82ed4141efa36ca1e03d948829c5f0f136b' 
  AND token = 'd3F5k3ykqhmbakTDQiDeKwIRFRikM57IL//R6quWbj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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