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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094ced2ccbe98f5b530b44598a15d925c4b53c19cc353e5aab6262d02d354280' 
  AND token = 'PXcQGF4vzvGMoON7C3nC+HgomHfn5GKtesdRJZYIP8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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