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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47de0b73e2c3db430a0a5881c57854c7fa07b390baf9bccf8b63d50222393dbc' 
  AND token = 'ydkwC/qAGex3BoLVcQsKw8bCB24zeZSYSfpCDQHKe6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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