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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dfb959707bcc7c9325f42be035c1a02b170f04f917ae71f139fd5914ca8105' 
  AND token = 'ntif6s2ot20f0j1MI7mAScbF3F6jubiwiGr9h4xv9gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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