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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed62c94a3daff07a83fc346749107ab2b324e7d6bebcabe0b9953c366eb6670' 
  AND token = '/hYbvetrnlyKBGxlABMhAfjqGHDtZ+sbDebLBiVw9kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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