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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79be6620d1ab1c49406179580cfb7adaff41dec934c756001596f90da82598eb' 
  AND token = 'k/yLAp7AonFBnJ3+mnZ0FAe6iQo0OB7tQ0aw6p/Od/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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