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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a057be065b4bc5112bc911f549bb4594170aee9d6de8a6db2ead6e766972c1d' 
  AND token = 'qrVpZ+pS+yb3EymZIBxkmIkmkhM09WLtm51iB8RHBGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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