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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec0587a82c202a595401edc98c25ecabea68f2b509d2d033367ab37056248dd' 
  AND token = 'k9CG+bF0Jxi87vYDGyPDO9r0HHZkQ3R2rTecqzjg/M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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