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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b419b909671c03b2dbce9b9b9a02cb235132ba8e04d8fa06edbd63081f257c' 
  AND token = 'd73l3zB4k0xvzFnv6ylhTFvBz2JjPlKDSTRprNF/kuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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