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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47908a288fce361dd6686e8238a5fa68870c85581ec615c9f071bd643a52809' 
  AND token = 'e4MqiJuGgokAWIOlDHGPFGqWoiiHOQW3fPAnOnnCoBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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