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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da13a84536bc2684a189fdf8c305379c70eed3bb4cf9b290c44d7fcfbfdbe975' 
  AND token = 'awiGJa4Kbo8Cv3+v5GX380GMThqcvu9qpSijqAA4KVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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