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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a3021e430c2e0e2e320311f168122e192353af360c34543be71b42fd8263ac' 
  AND token = '45FY1CU1IuhElKxztp2LDGzE0oV50bJXrGUczIU5bFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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