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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7211cf1dcca0e5ff2756c17e17eb68f51eb2bba936d0d955a016d51e081619' 
  AND token = 'UMqFO9e6m5CsaODQ/CsZUwrxIDmxRtdm2htZ9FubDBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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