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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4c100b984bec81de6abaed5f4f8bf15f4d8cbfdf181c806e612adf9d193d62' 
  AND token = 'txGMT4xrRPQhCIoJ3a0fOXmnAVSgX4jt628/ciYzLR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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