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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abd7c934abf42b0df5513138fd4a61a84a8dd0bf9d1b22bcf50009fae8e9fc8' 
  AND token = '7DNCovQqgN+voihyU/nnH+OqL8syTngteRV6ul50PF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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