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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf48c9a9f8df261f3e2b73943d1f88317caa6734fb39be18dfe14b29e4d5d952' 
  AND token = 'E/rWiyZnn/lYua4FsKmAOK/ZMJJE/0iSyUrtwvmQ40Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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