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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e8cb23e29447b3cdacfa1b3ad34c180e68678c21ba3342d3f9e26ddf108d06' 
  AND token = 'CfYA6hweS3P6RK/TKtaiYCKYQkn9E76wPnYW0POI7sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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