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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddaac3f8ede823ace606e2086da24ca44f4921e1f0faa262e924ef645e72b261' 
  AND token = '0z5K4gckad2+KQqWtdTIpB7X4OMSdIdA6JfbRink3Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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