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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607ef05aaf5b564ad3b27e5f5fd1a1a3bd324139508714be005f8375552af4cd' 
  AND token = 'UDl0C2xJllOoaAJhgpIRiZ+O7RQw3MsfjM1NiSVCG6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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