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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeb86cf88e1014d2e4f1e49c8d935eedeb75f3e9dcc34ee83fd3adec3fbbea1' 
  AND token = 'nMTRkc8qBPqb58rgpd6s+wdqOa1bi9H/8/qGmljQGoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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