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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7378582b9fc9d8492f40508ab9fd198411eb04768265b557c4ad58b56cd020d3' 
  AND token = 'dpkn89T8zT/qrm/yYE6rMBqxHTs9xwy2T3n7TEix6Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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