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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d3d560a477ff86ef05fb49e6b3b31686f0550c95206c43d13d0644c175e57b' 
  AND token = '3rx1hj1QwCB4ee1522wBlh3TrpIjIGdB9i3pk7wV62w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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