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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a1a08f7703b9e92833a6e0e4ed4bacedfca6db660877c415f9524f0c241638' 
  AND token = '1f8JXMDNWUKS3Oao01YQoXO2WeVh7T+2cP+3jaMc1sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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