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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e454d8b53d4c2dfbab2b76a5fcff0b49a80f1ebdc49169084da0e7adca437ea9' 
  AND token = 'OOtNosgNDpjvTTpHVyfgkDOowxwaWb42hE81XxAV6mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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