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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd816bb780e020012c9e8a92a36b5c2d907413ebf08d5f7cd7602bb44704c462f' 
  AND token = 'SdQPwTZTvvfIb3Vgwscatf6E1oXkMPjeg3lx9kYJrFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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