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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc5251396a3d300a6611768bc3ae81be3cfd4cb63fde2cc0d252d50e7e22f81' 
  AND token = 'Sy2lpkNJXeZLda3foLF/bVZXtxy46OjeDfMhWyS/kyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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