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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85dad5613323a5395039fcc3342ff2f37eff55946776e67653649e5b640cb9df' 
  AND token = 'UHCOOK5D5gFt1Si+e+aEkCZRZLvJd67GjpkrPVRbnks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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