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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaa97b9e7a36b03b06b7d5cf7cba410b005eeb35a47eb04bda8c81aa0c9b2aa' 
  AND token = '9htViLB7nlVw9qvLzD6tvkvDmyaVu1OFSTHxPr6IKQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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