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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b782b06588ea56f59781f565da5f6ebdeb27eda79ef037b6093d17cace4880' 
  AND token = 'YxcGCpf62hYoPaiuYq1fPgt2Jh134bp3aKpMnawlI+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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