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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91130001e693ad2e79ad890d773297a8b465ce2cd5876e2058a6297b311a73b1' 
  AND token = 'og14MgYZNoCW58rM9OaJ/pdHy04jzBjlZzUJmZSE1KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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