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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1be032dd29067ee5d291064d359281725c4462ecbd0481d26d3c6b94de6b549' 
  AND token = 'jkxO/tgOMy7wt29q4b7mWYnNcU+hf4J1eyrs113RNio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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