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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8063d0242218b37b4aacb6895663eb25ab15697b6f396e4f5d2b11ca6fce292a' 
  AND token = '+x/Ixf0MGD7LlAxj0yWpaDSCEi/DWv+Q+0oiH+TfGSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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