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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f6a0a0269d884ad0af0ea90a9fafe6c71a4829a8710f48a1b7341802174c26' 
  AND token = 'HjCt30/CMQXPxOlfJhkI9SRmdV+rPWCGGVqG/+Dmgig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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