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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf0e693e95e9702bec2d37ac08bafb7399253eb60051f95c883c55ab3a4eff9' 
  AND token = 'QNRDpxlijHkAgz5pj8gcI0U7U9eUETE8RYSRPa1zHe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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