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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55400df2ef3af6635a0887422d5e1bef7852046c45ae26f3add62095fc8747b4' 
  AND token = 'U/OEvmRsvP026ZUIvGEiJp/b2mOcGBLA/RCqmUH4Hnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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