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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcf24e936d5d1d115d77cd4aab7c8b16bc3025f776a1ae7b948e4cbb297c24d' 
  AND token = 'wn9Z4rPbVPl77MrlE0eBPorWWK9iAKPQaE2gBl+8YHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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