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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636af99dbdd88b9ca2853acc81dd82b4962722fac2ce5a5329d31f7b7c6af6c9' 
  AND token = '1lrDUEX0B8vZqGj9yGp8yufGwAyLU8dk6htblBLZE+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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