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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa2bed1833fb2eff6acddf9a88e5374c0793a0a6f8bd288770f6f21496544d9' 
  AND token = 'NpZZJbrm6qn568UJpa1PK6/F40rsc6tw6/Opxrdpfgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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