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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b06853c6bfc133de43dec6008792d860445504eb749458c03cd494a6bf5bf72' 
  AND token = '5yynEITDIHaPOtGafsPJ/yhTxsVTBBqzEcio/oZ3dos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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