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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16032f68754624bc2d8a440d2287ecf8aa7bf1f308cdef751d15400a2eff2193' 
  AND token = 'zo1okpiOtHi3unLH9CZEZu5XpUUITuvbgNQz2oD8XLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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