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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc704cc9c2f4b5f0e4d7a11f7a63adaa28b07e643cc78ba00be6648aebdb4a95' 
  AND token = 'XdQc3CtbBz1r16WDA9ktra6onCNqsA/8XhkWgg0Q778=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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