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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d70fe9309f7d3f05da99637d3310c397d76504aaa208f788ec0f2ed9db2f0d' 
  AND token = 'o6/ekm2eAtof0FLCkKwExWhWL/74FTLXc1aq3TBNano=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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