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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242007278c83572be6f5f448cad89c3d0fe90f47e659f62c00c01f38b4e6736b' 
  AND token = 'A/11ohH8A48qgxA+h/fEsWMlYRLIpdq47XJyd5vgHhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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